Noun
ectendomycorrhiza (plural ectendomycorrhizas or ectendomycorrhizae)
(biology) A form of ectomycorrhiza in which hyphae may also penetrate the plant cells
In some cases the hyphae may also penetrate the plant cells, in which case the mycorrhiza is called an ectendomycorrhiza. Source: Internet
The difference to ectomycorrhiza is that some hyphae actually penetrate into the root cells, making this type of mycorrhiza an ectendomycorrhiza. Source: Internet